[fix compile error] Remove incorrect @return documentation from CreateStringImpl function

[zct]

compiler: clang++ version: 21.1.0

flatbuffers/include/flatbuffers/flatbuffer_builder.h:1400:8: error: '@return' command used in a comment that is attached to a function returning void [-Werror,-Wdocumentation] 1400 | /// @return Returns the offset in the buffer where the string starts. | ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1 error generated

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[jtdavis777]

hey @zct - this pr looks great and I would love to merge it. I will need you to complete the Contributor License Agreement to do so!